01 LeSabre Custom AC low pressure service port

My son has an 01 LeSabre Custom with 87k. He says the a/c isn't working. I tried to put my gauges on it tonight, but I couldn't find the low pressure service port, but there's two on the high side (one on either side of a tubing connector).

I figure it should be obvious. I'm worried that the system was previously dorked with...with the two high-side ports and no low-side port. But everything looks factory.

The dryer is in the front left (passenger) of the engine compartment (when standing in front of and facing vehicle). I see the low-side line from evaporator come into it, then out of it down to the compressor in the center bottom, behind radiator. No port that I can find.

While looking for the a/c port, I also saw CVJ grease splattered all over on the driver side...it's always something. Just bought this last February (couldn't check the a/c too well) to replace the very nice 00 LeSabre 55k we bought in November for him. But the 00 didn't survive the collision with the truck that pulled in front of him...:banghead:

Not sure if that junction is where your orifice tube is......pull the caps off.....if one service port is smaller than the other, that is your low side port....

That makes perfect sense, but I've never seen one assembled like that. Didn't even consider that those Ports bookended the orifice tube. Thanks.